Change in vdsm[master]: vm: Allow to use 'serial' or 'virtio' type consoles

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Change subject: vm: Allow to use 'serial' or 'virtio' type consoles
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Patch Set 12:

* Update tracker::#1139159::OK
* Check Bug-Url::OK
* Check Public Bug::#1139159::OK, public bug
* Check Product::#1139159::OK, Correct product oVirt
* Check TR::SKIP, not in a monitored branch (ovirt-3.5 ovirt-3.4 ovirt-3.3 ovirt-3.2)
* Check merged to previous::IGNORE, Not in stable branch (['ovirt-3.5', 'ovirt-3.4', 'ovirt-3.3'])